x86/PoD: clean up types

x86/PoD: clean up types

GMFN values must undoubtedly be "unsigned long". "count" and
"entry_count", since they are signed types, should also be "long" as
otherwise they can't fit all values that can fit into "d->tot_pages"
(which currently is "uint32_t").

Beyond that, the patch doesn't convert everything to "long" as in many
places it is clear that "int" suffices. In places where "long" is being
used partially already, the change is however being done.

Furthermore, page order values have no use of being "long".

Finally, in the course of updating a few printk messages anyway, some
also get slightly shortened (to focus on the relevant information).

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: George Dunlap <george.dunlap@eu.citrix.com>